(19)
(11) EP 2 244 398 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
24.11.2010 Bulletin 2010/47

(43) Date of publication A2:
27.10.2010 Bulletin 2010/43

(21) Application number: 10166803.6

(22) Date of filing: 20.03.2003
(51) International Patent Classification (IPC): 
H04J 14/02(2006.01)
G02B 6/28(2006.01)
 H04B 10/08(2006.01)
(84) Designated Contracting States:
DE FR GB

(30) Priority: 27.03.2002 US 108734
27.03.2002 US 108741
28.03.2002 US 112022

(62) Application number of the earlier application in accordance with Art. 76 EPC:
03006220.2 / 1349308

(71) Applicant: FUJITSU LIMITED
Kawasaki-shi, Kanagawa 211-8588 (JP)

(72) Inventors:
  • Odate, Satoru
    Richardson, TX 75080 (US)
  • Kinoshita, Susumu
    Plano, TX 75024 (US)
  • Takeguchi, Koji
    Richardson, TX 75080 (US)
  • Titan, Cechan
    Plano, TX 75025 (US)

(74) Representative: HOFFMANN EITLE 
Patent- und Rechtsanwälte Arabellastrasse 4
81925 München
81925 München (DE)

   


(54) Flexible open ring optical network


(57) A flexible open ring optical network includes a plurality of nodes connected by twin or other suitable optical rings. Each node is operable to passively add and passively drop traffic from the rings. The nodes may include a transport element for each ring. The transport elements include an optical splitter element and an optical combiner element. The optical splitter element is operable to passively combine an add signal including local add traffic and a first transport signal including ingress traffic from a coupled optical 4 ring to generate a second transport signal including egress traffic tor transmission on the coupled optical ring. The optical combine element is coupled to the optical splitter element and is operable to passively split a third transport signal including the ingress traffic to generate a drop signal including local drop traffic and a fourth transport signal including the ingress traffic. Protection switching may be provided by selectively operable switches disposed in and distributed around the rings.







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